A fan site has started an online craze using the hashtag #PotterItForward for people to pop notes into the hallowed books - the messages may shock you.

Get weekly news by email

Harry Potter fans have decided to tell the boy wizard what he meant to them in the only way they can - by leaving notes inside the books chronicling his magical adventures.

Fan site MuggleNet have started an online craze using the hashtag #PotterItForward for people to pop notes into library or secondhand versions of the hallowed J. K. Rowling books - the messages may shock you.